Abstract
The purpose of this study is to reveal the flame spreading mechanism of tsunami fire. But the mechanism of tsunami fire is so complex that we couldn’t assess qualitatively. So the basic research on tsunami fire is needed. As a first step, we did flame spread experiment on only liquid fuel and liquid fuel/water layer under static liquid fuel. We measured flame spread rate. As a result, fuel thickness is in range of 5 - 15 mm, and flame spread rate over only liquid fuel is faster than liquid fuel/water layer’s at same fuel thickness. To reveal the gap of the flame spread rate at same liquid fuel thickness, we visualized current distribution by PIV and thermal boundary layer by shadowgraph method. By these results, we revealed that the thermal characteristic length is longer and the current characteristic depth of liquid fuel/water is deeper than that of liquid only fuel.
Highlights
In the Great East Japan Earthquake of 2011, the Tohoku region was seriously damaged by fires which were caused by the tsunami
Fuel thickness is in range of 5 - 15 mm, and flame spread rate over only liquid fuel is faster than liquid fuel/water layer’s at same fuel thickness
We revealed that the thermal characteristic length is longer and the current characteristic depth of liquid fuel/water is deeper than that of liquid only fuel
Summary
In the Great East Japan Earthquake of 2011, the Tohoku region was seriously damaged by fires which were caused by the tsunami (tsunami fires). The cause of the tsunami fires was basically electrical short circuits of some electricity such as from batteries, or car crashes of cars and so on. The ignited liquid fuels flowed on seawater and spread in unexpected directions. This was the mechanism of tsunami fires. This means that tsunami fires will be caused. There are few studies of flame spread over liquid fuel on a water layer like tsunami fires.
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